Reverse Image Search
Search by Image: Dropping an image from an image search into pop-up area created when you start to drag an image will get more related INFORMATION about the picture. Discovered when I was dragging images into Evernote from Google image searches. You can drop any image into a Google Images search text area (has a camera to the right). https://images.google.com or https://www.google.com/imghp?hl=en
Also check out the TinEye Reverse Image Search, which also has drag-and-drop, but I really like the plug-in which is available to browsers, and there is also a Bookmarklet available as well. On an Android the bookmarklet would work in a browser, but the normal way would be to long-click on an image (equivalent of right-click) then on "Share Image" ᚛ and then click on "MB Search for TinEye" available from Play store (Android applications). On IOS (MAC) Photofile Free ties into TinEye using search.
Image bookmarklets: (enter search arguments into prompt box)
images:
images:face (portraits)
images:huge
Evernote (evernote.com) is available on your desktop (Windows, Mac, Unix, Android, IOS) as a stand-alone application, and in your Browser. It is a good place to store information and have it available anywhere on all your devices. There is Premium service, but the Free use includes adding up to 60MB per month. Best way to learn to use it is with the desktop application, which has better editing capability than you have on mobile devices.
This bookmarklet for the above, because of prompt will work in any browser and on Android, whether your preferred/available input is a keyboard, touch screen keyboard, or voice (to enter words)
javascript:s=prompt('Enter%20sought%20after%20images%20at%20Google%20Images:','');if(s!=null)%20%20%20location='https://www.google.com/images?hl=en&q='+escape(s);%20void%200
More information on bookmarklets and keyword shortcuts:
Training Computers to classify images: Classifications of images is no longer limited to text comments related to images or the pages they are on. Computers have been trained to recognize images and concepts. The best identifications derive from recognition and verifications between computer and human cooperation.
Searching in other Browsers:
My experiences is mainly with Google, because I am comfortable with its options and keywords, but other browsers have also made big advances. So here are some very simple sample image searches without extra tags or keywords simply seaching on fingernails. You might note whether they assume real people and how well they fit, there are no exclusions in the following searches:
fingernails painted in
google,
bing,
yahoo (images.search.yahoo.com)
In the case of yahoo trying to do a simple image search without involving cryptic parameters and what appears to be web fingerprints is nearly impossible. and did allow it to be a top images search.